We now know why Kourtney Kardashian wasn’t at Kim Kardashian‘s birthday dinner.

On Friday night, Kim stepped out to celebrate her 43rd birthday at Funke with all of her Kardashian-Jenner sisters except for Kourtney, 44.

While sharing photos from inside her party, Kim revealed why Kourtney wasn’t in attendance.

Keep reading to find out more…

Kim said that Kourtney – who is currently pregnant – had to miss the party because she’s on “bed rest.”

“So blessed to have hit the jackpot of friends! I couldn’t have ever dreamed I would be so lucky to call these girls my friends ✨,” Kim wrote on Instagram. “Thank you for all the birthday love ❤️ and Kourt, I’m jumping in bed with you next week for our bed rest picnic.”

While wishing Kim a happy birthday, Kourtney referenced their years of sisterly drama.